By Adam Calderon, Joel Rumerman
Server controls are an quintessential element of each ASP.NET software we construct. They encapsulate browser visual appeal and server performance in a reusable item. they are often used throughout a number of pages inside of a unmarried ASP.NET program in addition to throughout a number of ASP.NET purposes. ASP.NET comes with loads of prebuilt server controls. we've basic controls similar to the label and we've got advanced controls comparable to the GridView. We even have the power to create our personal server controls to satisfy a necessity no longer met via one of many current controls by means of inheriting from the suitable base category and overriding its equipment as needed.
This version of utilizing server controls to encapsulate browser visual appeal and server performance has served our wishes good because the inception of ASP.NET 1.0, yet our server keep an eye on wishes are changing.
A new server regulate desire that has lately surfaced is the facility to include Ajax performance without delay into the server control.
This desire arose simply because our internet functions must be extra responsive and visually interactive than the normal ASP.NET repaint-the-entire-screen version and for this reason the conventional server keep an eye on provides. This requirement has emerged simply because clients are utilizing sites resembling Gmail, Live.com, Yahoo! Mail, and others that don't repaint the display whenever they click on a button or have to obtain clean information. fairly, they depend on Ajax to fetch clean info after which replace or upload to a component to the display dependent upon that info. simply because those sites are seriously used and clients particularly get pleasure from their adventure whereas utilizing those web content they anticipate different websites to accomplish with an identical attractiveness as they do. whilst a website doesn't practice with an identical beauty the person will frequently flow onto one other website that does. these well known purposes have raised the bar for what's an acceptably elementary net site.
Because our clients are challenging a website event that basically makes use of Ajax and we construct our ASP.NET sites utilizing server controls, we'd like a manner of simply growing server controls that not just encapsulate browser visual appeal and server performance, but in addition comprise Ajax performance in order that the server keep watch over itself is Ajax-enabled.
Taking a step again for a second, in contrast to different applied sciences you've gotten learn books on, ASP.NET AJAX server controls don't give you something that you just couldn't already do. We've constantly been in a position to embed Ajax-functionality into server controls ... it used to be only a genuine pain.
Furthermore, in case you had a number of server controls that had purchaser services it was once tough (but no longer most unlikely) to make sure that the buyer features that every server keep an eye on required didn't overwrite one another while rendered at the browser. monitoring down that challenge was once continually a enjoyable hour or so.
The trouble grew exponentially if we needed to incorporate a mechanism for asynchronously speaking with the server while the consumer pressed a button embedded within the server keep watch over. regardless of a helper communique library there have been regularly tips to getting your keep watch over to speak effectively with the server.
These obstacles have been challenging sufficient to guide to a couple undesirable programming behavior and undesirable code in addition to scare programmers clear of even trying to comprise Ajax-functionality of their server controls.
These difficulties are what Microsoft's ASP.NET AJAX solves.
In this e-book, we're going to coach you the way to exploit ASP.NET AJAX to create server controls that encapsulate Ajax performance. ASP.NET AJAX offers either server and buyer programming constructs that make including Ajax-capabilities to our server controls effortless. to not sound cliché, yet with ASP.NET AJAX lowering the complexity of including Ajax-capabilities to our server controls, we're capable of create server controls whose Ajax features are just constrained by means of our creativity. If we wish to listbox that self-updates with clean facts, if we need a type-ahead textbox that dynamically populates from the server, or if we need a button submits an handle for verification we will simply accomplish this via ASP.NET AJAX.
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Extra resources for Advanced ASP.NET AJAX Server Controls for .NET Framework 3.5
NET developer will ﬁnd familiar. Controls Starting in Chapter 3, “Components,” we begin our path to creating fully encapsulated AJAX-enabled controls by learning how to use and derive from three key client types: components, controls, and behaviors. We talk theory and provide a couple of practical examples. Application and how it acts like a client runtime with which we can interact. In Chapter 5, “Adding Client Capabilities to Server Controls,” we bring the server into the mix when we cover how to create server components that automatically create corresponding components.
Net/ajax is an excellent source. NET AJAX subject, and we wanted a chance to tell you and defend our decision before we got too far. This is something that we’ve repeatedly debated between the two of us and asked many colleagues for their opinion and was a decision that we didn’t come to easily. There are no chapters in which we cover how to use the UpdatePanel server control. Okay, you haven’t closed the book? Good. Let us explain how and why we came to this decision. Preface Simply put, the UpdatePanel is a server control.
As a primitive value, undefined refers to a newly declared variable’s default value. As a type, undefined refers to a variable that has never been declared and is accessed using the typeof keyword. 18 demonstrates the different usages of null and undefined. 18 Comparing null and the undefined Value var x = null; var y; alert alert alert alert (x); // alerts 'null' (y); // alerts 'undefined'-this is a value. (typeof(z)); // alerts-'undefined' this is a type. 19. 19 Comparing null to Itself var x; alert (x == null); // alerts 'true' alert (x === null); // alerts 'false' This typeof comparison is using undefined as a primitive value.